Large collective pitch control mechanism

[Adam Chapman]

Hi,

I'm looking for a collective pitch mechanism to put on a home-built
wind turbine. The shaft that I need to mount it on will be around 14
mm diameter.

The only parts for RC helicopters I can find dont give dimensions,
just the model oif helicopter they are made for.

Any guidance would be appreciated

Regards,
Adam

[Kevin]

Adam Chapman wrote:
> Hi,
>
> I'm looking for a collective pitch mechanism to put on a home-built
> wind turbine. The shaft that I need to mount it on will be around 14
> mm diameter.
>
> The only parts for RC helicopters I can find dont give dimensions,
> just the model oif helicopter they are made for.
>
> Any guidance would be appreciated
>
> Regards,
> Adam
but most are more than just collective pitch and I would not think even
a 90 powered bird will have a 14mm shaft

--
Kevin R
Reply address works

[Steve R.]

"Kevin" <dontemailme@ntlworld.com> wrote in message
news:zOCZk.48819$io1.12186@newsfe30.ams2...
> Adam Chapman wrote:
>> Hi,
>>
>> I'm looking for a collective pitch mechanism to put on a home-built
>> wind turbine. The shaft that I need to mount it on will be around 14
>> mm diameter.
>>
>> The only parts for RC helicopters I can find dont give dimensions,
>> just the model oif helicopter they are made for.
>>
>> Any guidance would be appreciated
>>
>> Regards,
>> Adam
> but most are more than just collective pitch and I would not think even a
> 90 powered bird will have a 14mm shaft
>
> --
> Kevin R
> Reply address works


Unfortunately, they're smaller than that. All 60 to 90 size birds I'm
familiar with have 10mm main shafts. The Vario XLV has a 12mm main shaft.
The OP might try Vario as they sell a number of large scale birds. One of
them might have a 14mm main shaft. Beyond that, he's not going to have much
luck with the standard size sport models.

Good luck,
Steve R.

[Robert Roland]

On Wed, 3 Dec 2008 12:27:35 -0800 (PST), Adam Chapman
<adam.chapman@student.manchester.ac.uk> wrote:

>I'm looking for a collective pitch mechanism to put on a home-built
>wind turbine. The shaft that I need to mount it on will be around 14
>mm diameter.

If you're not going to have any cyclic control at all, all you need is
a bearing. You should get a "deep groove" type, since they are
designed to handle more axial load. Ideally, you should use two axial
bearings turned opposite ways, but your load should be light enough to
work with a deep groove ball bearing. You might even get away with a
standard bearing.

You will, of course, need to attach some pushrods to both the inner
and outer race. If you use a piece of pipe that has a sliding fit on
the shaft, and then attach the bearing inner race solidly to the pipe,
you can attach pushrods to the rotating parts to the pipe. You will
also need some arrangement to keep the pipe from spinning on the
shaft.

A swash plate is essentially also just a bearing, only it has a ball
in the center to allow tilting.
--
RoRo

[Chuck]

This thread is a bit old, but has anyone considered using an automotive
throwout bearing?

"Robert Roland" <fake@ddress.no> wrote in message
news:1ldfj4humvstlmia3g7dco3jc1t2nvlhsv@4ax.com...
> On Wed, 3 Dec 2008 12:27:35 -0800 (PST), Adam Chapman
> <adam.chapman@student.manchester.ac.uk> wrote:
>
>>I'm looking for a collective pitch mechanism to put on a home-built
>>wind turbine. The shaft that I need to mount it on will be around 14
>>mm diameter.
>
> If you're not going to have any cyclic control at all, all you need is
> a bearing. You should get a "deep groove" type, since they are
> designed to handle more axial load. Ideally, you should use two axial
> bearings turned opposite ways, but your load should be light enough to
> work with a deep groove ball bearing. You might even get away with a
> standard bearing.
>
> You will, of course, need to attach some pushrods to both the inner
> and outer race. If you use a piece of pipe that has a sliding fit on
> the shaft, and then attach the bearing inner race solidly to the pipe,
> you can attach pushrods to the rotating parts to the pipe. You will
> also need some arrangement to keep the pipe from spinning on the
> shaft.
>
> A swash plate is essentially also just a bearing, only it has a ball
> in the center to allow tilting.
> --
> RoRo